Electrical insulator.



. G. W. GOODRIDGE. ELECTRICAL INSULATOR.

PATENTED NOV. 7, 1905.

APPLICATION FILED MAY5, 1905.

Fig. 4.

S E s S E N H I ATTO R NEYS UNITED STATES PATENT OFFICE.

ELECTRICAL INSULATOR.

Specification of Letters Patent.

Patented Nov. '7, 1905.

Application filed May 5, 1905. Serial No. 258,960.

To all whom it may concern.-

Be it known that I, GILBERT W. GooDRIDGE, a citizen of the United Statesof America, residingin Bridgeport, county of Fairfield, State ofConnecticut, have invented an Improved Electrical Insulator, of whichthe following is a specification.

My invention relates to that class of insulators which are designed forthe su pport of electrical conductors, particularly insulated conductorsin either exterior or interior wiring.

The object of my invention is to provide an insulator which will besimple in construction, inexpensive to manufacture, inexpensive to use,easily wired without the use of tie-wires, and yet be strong andefficient in use.

In the accompanying drawings, Figure 1 is a side elevation of acleat-insulator of my invention. Fig. 2 is a plan view of the same. Fig.3 is an enlarged transverse section taken on the line 3 3, Figs. 1 and2, showing the cleat secured in position and the wire connected up. Fig.4 is a side elevation of a single-wire insulator embodying my inventionwhen looking in the direction of the arrow 4, Fig. 7. Fig. 5 is a sideelevation of the same looking in the direction ofthe arrow 5, Fig. 7.Fig. 6 is aside elevation looking in the direction of the arrow 6, Fig.7; and Fig. 7 is a sectional plan on the line 7 7, Fig. 4:.

My invention may be embodied either in a cleat with two or more knobs,one for each wire, as illustrated, for example, in Figs. 1, 2, and 3, ormy invention may be embodied in single-knob form, as illustrated inFigs. 4 to 7. In the cleat construction the body A is formed withoutwardly-projecting posts B B with spiral grooves of the characterhereinafter described to receive and hold the conductors without the useof any clamp or any tie-wire. I prefer to make the posts B B cylindricaland to locate them (in the case of a cleat for a pair of wires) at theends beyond the holes a for the securing-screws; but in the case of athree-Wire cleat or for a larger number there will be another post orposts between the end posts. The spiral groove on each post B is shownat C and on an enlarged scale in Figs. 4 to 7 and is suflicient to takeone turn of the wire, the incoming end 00 and outgoing end 1 lyingclosely adjacent, as shown in Fig. 3. This groove C is made of varyingdepths, so as to produce angles 2 .2, Fig. 7, to kink the conductorsufficiently to prevent it from slipping when coiled into the groove. Inthe drawings I have shown the insulator as of triangular section at thebottom of the spiral groove.

It will be understood that the described construction of insulator-postwith a spiral groove of varying depths between the angles is applicableto a single-post or single-wire insulator, and I have so shown it at Bin Figs. 4, 5, 6, and 7, the hole 5 for the securing-screw, Fig. 7,being in this case in the center of the post. In this form the insulatorhas the advantage of dispensing with the use of the tiewire commonlyemployed. In the case of the cleat my invention has the advantage ofdispensing with the use of the usual upper half of the cleat,diminishing the cost, facilitating wiring, and permitting the use ofshorter securing-screws.

I claim as my invention 1. An insulator-post, having a circumferentialspiral groove to receive and hold conductor-wire, the post being ofangular cross-section at the groove, which is of varying depth betweenall the angles.

2. An insulator having a cylindrical body with a circumferential spiralgroove around it, the body being of triangular section at the groove.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GILBERT WV. GOODRIDGE.

Witnesses:

N. W. HARDER, H. G. WALES.

